Thanks all for the comments and links!

Very new to assembler and 6502. I've been choosing various simple algorithms to implement in order to learn. I keep assuming that I can use RTS to return from a sub routine after branching to it. But from what I'm reading, I can only do that after using JSR. So I'm wondering if there's a common way ...

The Apple II and maybe a few other computers had the video accessing the memory while the processor's phase 2 was low. You could also use dual-port memory, although it's rare, small, and expensive.

Ah, that makes sense. Hmm, so if I just invert the clock signal for a second processor to handle ...

Thanks for all the replies. My initial desire for this display was to be able to examine memory without relying on the computer to manage display, so I was hoping to implement this in a way that runs separately from the 6502 and pulls the led data from the same memory that the computer is using ...

Super-newb here. Been devouring anything I can 6502 related. Really want to build a simple Homebrew for all the usual reasons. I would like to eventually expand the computer so it has a built in "display" created from LED matrices. Initially just an 8x8 multiplexed with a MAX7219 or similar. I would ...